The Ultimate Guide to High Availability with MariaDB

!

Sintassi

NOT, !

Spiegazione

NOT logico. Restituisce 1 se l'operando è 0, 0 se l'operando è diverso da zero, mentre NOT NULL restituisce NULL.

Esempi

MariaDB [(none)]> SELECT NOT 10;
+--------+
| NOT 10 |
+--------+
|      0 |
+--------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT NOT 0;
+-------+
| NOT 0 |
+-------+
|     1 |
+-------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT NOT NULL;
+----------+
| NOT NULL |
+----------+
|     NULL |
+----------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT ! (1+1);
+---------+
| ! (1+1) |
+---------+
|       0 |
+---------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT ! 1+1;
+-------+
| ! 1+1 |
+-------+
|     1 |
+-------+
1 row in set (0.00 sec)

MariaDB [(none)]>

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